/Engine/Source/Editor/UnrealEd/Public/EdGraphUtilities.h
Returns the first pin marked as an MapParam, usually returning nullptr
static [UEdGraphPin](API\Runtime\Engine\EdGraph\UEdGraphPin) * FindMapParamPin ( const [UFunction](API\Runtime\CoreUObject\UObject\UFunction) * Function, const [UEdGraphNode](API\Runtime\Engine\EdGraph\UEdGraphNode) * Node )